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<a href="http://www.bilibili.com">点我</a>

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<a href="http://www.bilibili.com"  target = "_self">点我</a>
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<a href="http://www.bilibili.com"  target = "_blank">点我</a>
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<a href="./HTMLStudy2"  target = "_blank">点我</a>
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<a href="mailto:1990609801@qq.com"  target = "_blank">联系我们</a>
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